| PISA | Pacific Islander Student Alliance 
| Others |
| PISA | Pair Interaction Structureless Approximation
| Others |
| PISA | Parachute Industries Of Southern Africa
| Others |
| PISA | Parents Increasing Student Achievement
| Others |
| PISA | Partnerships for International Strategies in Asia
| Others |
| PISA | Phenix Integrated Simulation Application
| Others |
| PISA | Phoenix International Sport Automobiles
| Others |
| PISA | Photovoltaic Information Strategy To Architects
| Others |
| PISA | Photovoltaic Information System For Architects
| Others |
| PISA | Pittsburgh Indoor Sports
| Others |
| PISA | Pittsburgh Indoor Sports Arena
| Others |
| PISA | Plan for International Student Assessment
| Others |
| PISA | Pleasure Island Soccer Association
| Others |
| PISA | Polygenic Inheritance Signal In Association
| Others |
| PISA | Portable Instruction Set Architecture
| Others |
| PISA | Position Intensity And Shape Analysis
| Others |
| PISA | Preliminary Initial Site Assessment
| Others |
| PISA | Printer Seaman Apprentice
| Others |
| PISA | Professional Investigators and Security Association
| Others |
| PISA | Program For International Student Assessment
| Others |
| PISA | Program of International Student Assessment
| Others |
| PISA | Programmable Intelligent Services Accelerator
| Others |
| PISA | Programme for International Assessment As
| Others |
| PISA | Programme for International Student Achievement
| Others |
| PISA | Programme for International Student Assessment
| Others |
| PISA | Protein Interfaces Surfaces and Assemblies
| Others |
| PISA | Proteins Interfaces Structures and Assemblies
| Others |
| PISA | Provisional Industrial Security Approval
| Others |
| PISA | Proximal Isovelocity Surface Area
| Others |